readme wording

README.md

@@ -12,7 +12,7 @@ Simple and fast histogramming in python via
 [pybind11](https://github.com/pybind/pybind11) and (optionally)
 [OpenMP](https://www.openmp.org/).
 
-`pygram11` provides fast functions for generating histograms (and
+`pygram11` provides fast functions for calculating histograms (and
 their sums-of-weights squared). The API is very simple, check out the
 documentation (you'll also find [some
 benchmarks](https://pygram11.readthedocs.io/en/stable/purpose.html#some-benchmarks)